Wie bestimmt man, wie viel Prozent des Speichers (Heap) auf dem ESP32 frei sind?

#include <esp_heap_caps.h>

uint32_t freeHeapBytes = heap_caps_get_free_size(MALLOC_CAP_DEFAULT);
uint32_t totalHeapBytes = heap_caps_get_total_size(MALLOC_CAP_DEFAULT);
float percentageHeapFree = freeHeapBytes * 100.0f / (float)totalHeapBytes;

// Print to serial
Serial.printf("[Memory] %.1f%% free - %d of %d bytes free\n", percentageHeapFree, freeHeapBytes, totalHeapBytes);